Download Mendeley1.88A crystal structure of the C domain of hCyP33: A novel domain of peptidyl-prolyl cis-trans isomerase
Wang, T., Yun, C.-H., Gu, S.-Y., Chang, W.-R., Liang, D.-C.(2005) Biochem Biophys Res Commun 333: 845-849
- PubMed: 15963461
- DOI: https://doi.org/10.1016/j.bbrc.2005.06.006
- Primary Citation of Related Structures:
1ZMF - PubMed Abstract:
Cyclophilins (CyPs) are a widespreading protein family in living organisms and possess the activity of peptidyl-prolyl cis-trans isomerase (PPIase), which is inhibited by cyclosporin A (CsA). The human nuclear cyclophilin (hCyP33) is the first protein which was found to contain two RNA binding domains at the amino-terminus and a PPIase domain at the carboxyl-terminus. We isolated the hCyP33 gene from the human hematopoietic stem/progenitor cells and expressed it in Escherichia coli, and determined the crystal structure of the C domain of hCyP33 at 1.88 A resolution. The core structure is a beta-barrel covered by two alpha-helices. Superposition of the structure of the C domain of hCyP33 with the structure of CypA suggests that the C domain contains PPIase active site which binds to CsA. Furthermore, C domain seems to be able to bind with the Gag-encoded capsid (CA) of HIV-1 and may affect the viral replication of HIV-1. A key residue of the active site is changed from Ala-103-CypA to Ser-239-hCyP33, which may affect the PPIase domain/substrates interactions.
Organizational Affiliation:
National Key Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, PR China.
